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Full text of "The Morphology And Evolution Of The Apes And Man"

234
MORPHOLOGY AND EVOLUTION
all specimens, nor in the other Apes. The suprascapular and transverse cerrical arteries run much as in Man, but they do not form a marked anastomosis round the scapula in the Chimpanzee and Gibbon as in Man, The superior intercostal artery supplies the structures in the first or first two intercostal spaces ; in one Chimpanzee it passed into the first thoracic inter vertebral foramen. The internal mammary artery may arise alone or together with the superior intercostal artery. Its course and relations are as in Man, but it divides at different levels into the musculo-phrenic and superior epigastric arteries, which are distributed as in Man. In the Chimpanzee it divides in the fifth intercostal space. It supplies the pericardium, thymus gland and mediastinal tissues.
The Axillary Artery has very similar relations to those in Man, but the branches differ, as the following table shows:
Man
Chimpanzee (Jig. 41)
Gorilla
Superior thoracic Acromio-thoracic Long thoracic Alar thoracic Subscapular.. Anterior circumflex Posterior       ,,
! Acromio-thoracic
Subscapular ^major)
Muscular
Thoraco-dorsal
Humeral trunk
Anterior circumflex Posterior       ,, Circumflex scapular Subscapular (minor)
Acromio-thoracic Long thoracic
*
Subscapular (major)
Muscular
Thoraco-dorsal
Humeral trunk Anterior circumflex Posterior         Circumflex scapular Subscapular (minor)
Although the branches arise differently in some cases the ultimate distribution is much as in I\Ian. The most notable feature is the retention of a humeral circumflex trunk in the Apes, which divides later. This is a feature of the Cercopithecidse. In the Orang the artery gives off